Improvement of room temperature ductility for Mo and Fe modified Ti2AlNb alloy

Satoshi Emura; Kaneaki Tsuzaki; Koichi Tsuchiya

doi:10.1016/j.msea.2010.09.003

Improvement of room temperature ductility for Mo and Fe modified Ti₂AlNb alloy

Satoshi Emura, Kaneaki Tsuzaki, Koichi Tsuchiya

Research output: Contribution to journal › Article › peer-review

59 Citations (Scopus)

Abstract

The effect of hot bar rolling and a subsequent annealing in the (B2+α₂) two-phase region on the mechanical properties was investigated for the Ti-25Al-14Nb-2Mo-1Fe (mol%) orthorhombic phase base alloy. After this thermomechanical treatment in the (B2+α₂) two-phase region, a 'Van Gogh's Sky (VGS)' structure, with wavy and curled bands of spherical α₂ precipitates, was obtained. Electron probe micro-analysis (EPMA) examinations indicated that the VGS bands correspond to the Nb and Mo lean regions. The width and spacing of VGS bands varied with thermomechanical treatment conditions (forging temperature before hot bar rolling as well as annealing temperature after the rolling). The samples with the VGS structure exhibited the higher tensile elongation-to-failure at room temperature. The creep resistance at 923K decreased with the existence of the VGS structure. These mechanical properties were affected by the width and spacing of the VGS bands.

Original language	English
Pages (from-to)	355-362
Number of pages	8
Journal	Materials Science and Engineering A
Volume	528
Issue number	1
DOIs	https://doi.org/10.1016/j.msea.2010.09.003
Publication status	Published - Nov 25 2010
Externally published	Yes

All Science Journal Classification (ASJC) codes

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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10.1016/j.msea.2010.09.003

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title = "Improvement of room temperature ductility for Mo and Fe modified Ti2AlNb alloy",

abstract = "The effect of hot bar rolling and a subsequent annealing in the (B2+α2) two-phase region on the mechanical properties was investigated for the Ti-25Al-14Nb-2Mo-1Fe (mol%) orthorhombic phase base alloy. After this thermomechanical treatment in the (B2+α2) two-phase region, a 'Van Gogh's Sky (VGS)' structure, with wavy and curled bands of spherical α2 precipitates, was obtained. Electron probe micro-analysis (EPMA) examinations indicated that the VGS bands correspond to the Nb and Mo lean regions. The width and spacing of VGS bands varied with thermomechanical treatment conditions (forging temperature before hot bar rolling as well as annealing temperature after the rolling). The samples with the VGS structure exhibited the higher tensile elongation-to-failure at room temperature. The creep resistance at 923K decreased with the existence of the VGS structure. These mechanical properties were affected by the width and spacing of the VGS bands.",

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AU - Emura, Satoshi

AU - Tsuzaki, Kaneaki

AU - Tsuchiya, Koichi

PY - 2010/11/25

Y1 - 2010/11/25

N2 - The effect of hot bar rolling and a subsequent annealing in the (B2+α2) two-phase region on the mechanical properties was investigated for the Ti-25Al-14Nb-2Mo-1Fe (mol%) orthorhombic phase base alloy. After this thermomechanical treatment in the (B2+α2) two-phase region, a 'Van Gogh's Sky (VGS)' structure, with wavy and curled bands of spherical α2 precipitates, was obtained. Electron probe micro-analysis (EPMA) examinations indicated that the VGS bands correspond to the Nb and Mo lean regions. The width and spacing of VGS bands varied with thermomechanical treatment conditions (forging temperature before hot bar rolling as well as annealing temperature after the rolling). The samples with the VGS structure exhibited the higher tensile elongation-to-failure at room temperature. The creep resistance at 923K decreased with the existence of the VGS structure. These mechanical properties were affected by the width and spacing of the VGS bands.

AB - The effect of hot bar rolling and a subsequent annealing in the (B2+α2) two-phase region on the mechanical properties was investigated for the Ti-25Al-14Nb-2Mo-1Fe (mol%) orthorhombic phase base alloy. After this thermomechanical treatment in the (B2+α2) two-phase region, a 'Van Gogh's Sky (VGS)' structure, with wavy and curled bands of spherical α2 precipitates, was obtained. Electron probe micro-analysis (EPMA) examinations indicated that the VGS bands correspond to the Nb and Mo lean regions. The width and spacing of VGS bands varied with thermomechanical treatment conditions (forging temperature before hot bar rolling as well as annealing temperature after the rolling). The samples with the VGS structure exhibited the higher tensile elongation-to-failure at room temperature. The creep resistance at 923K decreased with the existence of the VGS structure. These mechanical properties were affected by the width and spacing of the VGS bands.

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Improvement of room temperature ductility for Mo and Fe modified Ti₂AlNb alloy

Abstract

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